Add a list-view alongside the existing card grid (issue #957) and
multi-select batch delete (issue #1045) for documents inside a knowledge
base. The two views are toggled from the toolbar and the preference is
persisted in localStorage. Selection state is shared between views with
shift-range support and a sticky batch-action bar.
Backend
- POST /api/v1/knowledge/batch-delete: validates KB scope and editor
permission, then delegates to the existing DeleteKnowledgeList service
which already cascades vector/file/graph cleanup. Caps batch size at
200 and uses a single GetKnowledgeBatch call for membership validation.
Frontend
- DocumentListView: table layout with sticky header, checkbox column
(with indeterminate select-all), file-type icons, status badges,
per-row action menu.
- DocumentBatchBar: floating pill bar with selected count and delete
action; appears when items are selected.
- KnowledgeBase.vue: view-mode toggle, selection state, batch-delete
confirmation dialog, hover/active checkbox overlay on existing cards.
- Extracted formatFileSize and getFileIcon to utils/files.ts to share
with the new list view and avoid further drift from the existing
inline copies.
- i18n keys added for zh-CN, en-US, ko-KR, ru-RU.
Closes#1045Closes#957
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